EP 0765635 A2 19970402 - Equipment and method for calibration and quality assurance of an ultrasonic bone analysis apparatus
Title (en)
Equipment and method for calibration and quality assurance of an ultrasonic bone analysis apparatus
Title (de)
Vorrichtung und Verfahren zum Eichen und zur Qualitätssicherung einer Vorrichtung für die Knochen-Ultraschallanalyse
Title (fr)
Dispositif et méthode pour étalonner et assurer la qualité d'un appareil d'analyse ultrasonique d'un os
Publication
Application
Priority
US 53413195 A 19950926
Abstract (en)
An improvement to calibration and quality assurance of an ultrasonic bone analysis apparatus is achieved by using phantoms. A received ultrasound signal that passed through a first phantom is used as a baseline for calculating BUA. The first phantom has an attenuation-versus-frequency profile that is substantially flat in a frequency range of 200 to 1000 kHz and a sound impedance that approximates that of soft human tissue. A propagation time of the signal is used to calibrate a zero point of the apparatus. A second phantom has an attenuation in a frequency range of 200-1000 kHz which approximates that of a human foot, including an attenuation-versus-frequency profile that is substantially linear in the frequency range of 200-600 kHz and is approximately 1 dB/MHz per mm. A received ultrasound signal that passed through the second phantom is used to calibrate the apparatus for a BUA calculation, and can also be used for at least one of determining and correcting a drift of the apparatus. A third phantom has a predetermined SOS that is substantially independent of temperature. A received ultrasound signal that passed through the third phantom is used to calibrate the apparatus for a SOS calculation, and can also be used for at least one of determining and correcting instrument drift. An ultrasonic signal is transmitted through mutually touching transducer pads. The received signal is used as a baseline for calculating BUA. A measurement of the propagation time of the received signal is compared with a temporally-proximate measurement of an ultrasonic signal that passed through a patient's heel to determine a time of propagation through the heel. <IMAGE>
IPC 1-7
IPC 8 full level
A61B 8/00 (2006.01); A61B 5/107 (2006.01); A61B 8/08 (2006.01)
CPC (source: EP US)
A61B 5/1074 (2013.01 - EP US); A61B 8/0875 (2013.01 - EP US); A61B 8/587 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
US 5755228 A 19980526; AU 6568696 A 19970410; AU 704278 B2 19990415; CA 2185761 A1 19970327; EP 0765635 A2 19970402; EP 0765635 A3 19971001; JP H09192129 A 19970729; US 5935073 A 19990810
DOCDB simple family (application)
US 53413195 A 19950926; AU 6568696 A 19960918; CA 2185761 A 19960917; EP 96307032 A 19960926; JP 25490096 A 19960926; US 86680497 A 19970530